Roller cooler



FIG. 1 is a front, left side perspective view of a roller cooler showing our new design;

FIG. 2 is a left side elevation view thereof with the lid in a closed position;

FIG. 3 is a right side elevation view of FIG. 2;

FIG. 4 is a front elevation view of FIG. 2;

FIG. 5 is a rear elevation view of FIG. 2;

FIG. 6 is a top plan view of FIG. 2; and,

FIG. 7 is a bottom plan view of FIG. 2. 

The ornamental design for a roller cooler, as shown and described. 